Endress+Hauser OUSTF10 User manual

Products Solutions Services
Operating Instructions
OUSTF10
Optical sensor with the OUA260 flow assembly for
the measurement of undissolved solids
BA00500C/07/EN/03.24-00
71643600
2024-01-31

Table of contents OUSTF10
2 Endress+Hauser
Table of contents
1 About this document ........... 3
1.1 Warnings ........................... 3
1.2 Symbols ............................ 3
1.3 Symbols on the product ............... 3
2 Basic safety instructions ....... 4
2.1 Requirements of the personnel ......... 4
2.2 Intended use ........................ 4
2.3 Workplace safety .................... 4
2.4 Operational safety ................... 5
2.5 Product security ..................... 5
3 Product description ............. 6
3.1 Sensor design ....................... 6
3.2 Measuring principle .................. 6
4 Incoming acceptance and
product identification .......... 7
4.1 Incoming acceptance ................. 7
4.2 Product identification ................. 8
4.3 Manufacturer address ................ 8
4.4 Scope of delivery ..................... 8
5 Mounting procedure ............ 9
5.1 Mounting requirements ............... 9
5.2 Mounting the sensor ................ 12
5.3 Post-mounting checks ............... 13
6 Electrical connection .......... 13
6.1 Connecting the sensor ............... 13
6.2 Lamp voltage ....................... 14
6.3 Versions for use in hazardous areas .... 14
6.4 Ensuring the degree of protection ..... 17
6.5 Post-connection check ............... 18
7 Commissioning ................ 19
7.1 Function check ..................... 19
7.2 Calibrating/adjusting the sensor ...... 19
8 Maintenance .................. 21
8.1 Maintenance schedule ............... 21
8.2 Replacing the hazardous area lamp .... 22
8.3 Replacing the collimated incandescent
lamp .............................. 22
8.4 Replacing the sensor window and seal .. 24
9 Repair .......................... 26
9.1 General notes ...................... 26
9.2 Spare parts ........................ 26
9.3 Return ............................ 26
9.4 Disposal ........................... 26
10 Accessories .................... 27
10.1 Flow assembly ...................... 27
10.2 Cable ............................. 27
11 Technical data ................. 28
11.1 Input .............................. 28
11.2 Environment ....................... 28
11.3 Process ............................ 28
11.4 Mechanical construction ............. 29
Index ................................. 30

OUSTF10 About this document
Endress+Hauser 3
1 About this document
1.1 Warnings
Structure of information Meaning
LDANGER
Causes (/consequences)
If necessary, Consequences of non-
compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious injury.
LWARNING
Causes (/consequences)
If necessary, Consequences of non-
compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious injury.
LCAUTION
Causes (/consequences)
If necessary, Consequences of non-
compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.
NOTICE
Cause/situation
If necessary, Consequences of non-
compliance (if applicable)
‣Action/note
This symbol alerts you to situations which may result in damage to property.
1.2 Symbols
Additional information, tips
Permitted
Recommended
Not permitted or not recommended
Reference to device documentation
Reference to page
Reference to graphic
 Result of an individual step
1.3 Symbols on the product
Reference to device documentation
Do not dispose of products bearing this marking as unsorted municipal waste. Instead, return them to the
manufacturer for disposal under the applicable conditions.

Basic safety instructions OUSTF10
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2 Basic safety instructions
2.1 Requirements of the personnel
• Installation, commissioning, operation and maintenance of the measuring system may be
carried out only by specially trained technical personnel.
• The technical personnel must be authorized by the plant operator to carry out the specified
activities.
• The electrical connection may be performed only by an electrical technician.
• The technical personnel must have read and understood these Operating Instructions and
must follow the instructions contained therein.
• Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the Operating Instructions provided must be carried out only
directly at the manufacturer's site or by the service organization.
2.2 Intended use
The scattered light turbidity sensor is used to measure undissolved solids, emulsions and
immiscible media in process liquids. The sensor is suitable for use in a wide range of
applicationsin a variety of industrial sectors , such as:
• Outgoing goods inspection/purity monitoring
• Filter control
• Condensate regulation
• Turbidity measurement in
• Breweries
• Drinking water
• Brine
• Leak detection in heat exchanger
Any use other than that intended puts the safety of people and the measuring system at risk.
Therefore, any other use is not permitted.
The manufacturer is not liable for harm caused by improper or unintended use.
2.3 Workplace safety
As the user, you are responsible for complying with the following safety conditions:
• Installation guidelines
• Local standards and regulations
• Regulations for explosion protection
Electromagnetic compatibility
• The product has been tested for electromagnetic compatibility in accordance with the
applicable international standards for industrial applications.
• The electromagnetic compatibility indicated applies only to a product that has been
connected in accordance with these Operating Instructions.

OUSTF10 Basic safety instructions
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2.4 Operational safety
Before commissioning the entire measuring point:
1. Verify that all connections are correct.
2. Ensure that electrical cables and hose connections are undamaged.
3. Do not operate damaged products, and protect them against unintentional operation.
4. Label damaged products as defective.
During operation:
‣If faults cannot be rectified,
take products out of service and protect them against unintentional operation.
2.5 Product security
2.5.1 State of the art
The product is designed to meet state-of-the-art safety requirements, has been tested, and
left the factory in a condition in which it is safe to operate. The relevant regulations and
international standards have been observed.
2.5.2 Versions with hazardous area lamp
‣Observe the safety instructions in the XA pertaining to this manual.
Safety instructions for electrical equipment in hazardous areas, photometer sensors,
XA01403C

Product description OUSTF10
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3 Product description
3.1 Sensor design
1 12 34
5 5
A0054700
 1 Sensor with flow assembly OUA260
1 Cable connection
2 Lamp module
3 Flow assembly OUA260 (depending on version)
4 Detector module
5 Connection for air purge function (optional)
The detector and lamp can vary on account of the individual options ordered.
3.2 Measuring principle
Turbidity
Turbidity refers to the appearance of a liquid that contains suspended particles. The presence
of these particles causes the light to be scattered and absorbed, giving the liquid a turbid, or
cloudy, appearance. The amount of light scattered or absorbed in a liquid can be used in a
measuring system to determine the degree of turbidity.
Scattered light method
A focused parallel beam of light is passed through the medium. This beam is known as the
transmitted light and is measured by a transmitted light detector. If the medium does not
contain any particles, the transmitted light detector detects all the light transmitted by the
light source.
If there are particles in the medium, the light is scattered in all directions, but primarily in a
forward direction. The optical system is designed such that the scattered light is measured at
an angle of 11°. This angle of measurement ensures that the maximum scattering signal
present is detected at the scattered light detector.

OUSTF10 Incoming acceptance and product identification
Endress+Hauser 7
1 2 34
5
68 7
A0029413
 2 Scattered light measurement
1 Light source (lamp)
2 Orifice plates and lenses
3 Scattered light
4 Scattered light detector
5 Transmitted light detector
6 Neutral broadband density filter with anti-reflex coating
7 Medium
8 Broadband NIR filter (780 nm +)
4 Incoming acceptance and product identification
4.1 Incoming acceptance
1. Verify that the packaging is undamaged.
 Notify the supplier of any damage to the packaging.
Keep the damaged packaging until the issue has been resolved.
2. Verify that the contents are undamaged.
 Notify the supplier of any damage to the delivery contents.
Keep the damaged goods until the issue has been resolved.
3. Check that the delivery is complete and nothing is missing.
 Compare the shipping documents with your order.
4. Pack the product for storage and transportation in such a way that it is protected
against impact and moisture.
 The original packaging offers the best protection.
Make sure to comply with the permitted ambient conditions.
If you have any questions, please contact your supplier or your local Sales Center.

Incoming acceptance and product identification OUSTF10
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4.2 Product identification
4.2.1 Nameplate
The nameplate provides you with the following information on your device:
• Manufacturer identification
• Order code
• Serial number
• Safety information and warnings
‣Compare the information on the nameplate with the order.
4.2.2 Identifying the product
Product page
www.endress.com/oustf10
Interpreting the order code
The order code and serial number of your product can be found in the following locations:
• On the nameplate
• In the delivery papers
Obtaining information on the product
1. Go to www.endress.com.
2. Page search (magnifying glass symbol): Enter valid serial number.
3. Search (magnifying glass).
 The product structure is displayed in a popup window.
4. Click the product overview.
 A new window opens. Here you fill information pertaining to your device, including
the product documentation.
4.3 Manufacturer address
Endress+Hauser Conducta Inc.
4123 East La Palma Avenue, Suite 200
Anaheim, CA 92807 USA
4.4 Scope of delivery
The scope of delivery comprises the following, :
• Detector and lamp module without flow assembly or
• Detector and lamp module mounted on flow assembly OUA260
• Operating Instructions
‣If you have any queries:
Please contact your supplier or local sales center.

OUSTF10 Mounting procedure
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5 Mounting procedure
5.1 Mounting requirements
5.1.1 Measuring system
An optical measuring system comprises:
• Sensor (photometer) OUSTF10
• Transmitter, e. g. Liquiline CM44P
• Cable set, e. g. CUK80
• Assembly OUA260
1 2
3
7
54
6
 3 Example of a measuring system with a photometer sensor
1 Pipe 5 Flow assembly OUA260
2 Transmitter CM44P 6 Sensor: light source (lamp)
3 CUK80 cable set 7 CUK80 cable set
4 Sensor: detector

Mounting procedure OUSTF10
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5.1.2 Dimensions
A B
C
A0031511
 4 Sensor module
A Dimension of lamp → Table
B Dimension of detector → Table
C Assembly; see Technical Information for assembly
Lamp type Dimension A in mm (inch)
Collimated incandescent lamp 151.3 (5.96)
Detector type Dimension B in mm (inch)
OUSTF10 101.6 (4.0)
102.8 (4.05)
The total length of the sensor module is derived from the lengths of the lamp, the
detector and the assembly.
The dimensions of the OUA260 assembly are provided in Technical Information,
TI00418C.
‣Allow an additional gap of 5 cm (2") on both the lamp side and detector side of the sensor
to connect the sensor cable.

OUSTF10 Mounting procedure
Endress+Hauser 11
5.1.3 Mounting bracket
A
B
C
D
E
A0028250
 5 Mounting angles. The arrows indicate the direction of medium flow in the pipe.
A Suitable mounting angle, better than C
B Optimum mounting angle, best installation position
C Acceptable mounting angle
D Mounting angle to be avoided
E Forbidden mounting angle

Mounting procedure OUSTF10
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5.1.4 Air purge
The optical windows can be purged with dry air or nitrogen through pneumatic ports,
preventing the formation of condensate on the optical windows.
45 123
A0054701
 6 Purge gas supply via connections to the detector and lamp of the process photometer
1 Compressed air or nitrogen supply
2 Air drier (not required for nitrogen)
3 Pressure regulator
4 Flow controller
5 Process photometer OUSTF10
The purge gas must be clean and dry (ultra zero air).
Maximum gauge pressure: 0.07 bar (1 psi)
Flow rate: 50 to 100 ml/min
5.2 Mounting the sensor
The sensors have been specifically designed so that they can be installed in the process
together with a flow assembly, such as the OUA260. The flow assembly can be installed either
directly in a process line or in a bypass line.
The sensor cannot be used without an assembly.
‣Make sure that the sensor housing and detector housing are aligned horizontally. This
ensures that the optical windows are vertically aligned as this prevents buildup on the
window surfaces.
‣Install the sensor upstream from the pressure regulators.
‣Leave enough room for the cable connector at the end of the lamp and at the end of the
detector housing. Unimpeded access to these areas is also required for connection/removal
tasks.
‣The operation of sensors under pressure prevents the formation of air or gas bubbles.

OUSTF10 Electrical connection
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NOTICE
Mounting errors
Possibility of sensor damage, twisted cables or similar
‣Make sure that the sensor bodies are protected against damage from external forces - such
as trolleys on adjacent paths.
‣Remove the cable before you screw the lamp or detector onto the flow assembly.
‣Make sure to avoid exerting excessive tensile force on the cable (e.g. from jerky pulling
movements).
‣Make sure to observe the national grounding regulations when using metal assemblies.
If the sensor is ordered together with the assembly OUA260, the flow assembly is ready-
mounted on the sensor upon delivery. The sensor is ready for use immediately.
If the sensor and assembly are ordered separately, you must mount the sensor as follows:
1. Install flow assembly OUA260 in the process via the process connections.
2. Make sure to fit the O-ring seals on the lamp and detector.
Screw the lamp and detector onto the flow assembly.
The lamp and detector can be installed in and removed from the assembly without this
affecting the process line.
5.3 Post-mounting checks
Put the sensor into operation only if you can answer "yes" to the following questions:
• Are the sensor and cable undamaged?
• Have you chosen a correct mounting angle?
6 Electrical connection
LWARNING
Device is live!
Incorrect connection may result in injury or death!
‣The electrical connection may be performed only by an electrical technician.
‣The electrical technician must have read and understood these Operating Instructions and
must follow the instructions contained therein.
‣Prior to commencing connection work, ensure that no voltage is present on any cable.
6.1 Connecting the sensor
The sensor is connected to the transmitter via the pre-terminated or labeled cable set CUK80
(for connection to CM44P) or OUK20 (for connection to CVM40) . The terminals and labeling
may vary depending on the transmitter in use. The cable set must be ordered separately.
‣Do not shorten or otherwise modify the CUK80 cable!

Electrical connection OUSTF10
14 Endress+Hauser
RD
BK
GY
GY
WH
GN
A B
YE
YE
BK
BK
A0028384
 7 Connecting cable OUSTF10
A Light source (lamp) power supply
B Signals of scattered light and transmitted light detector
CM44P terminal Cable color Assignment
P+ YE (thick) Lamp voltage +
S+ YE (thin) Detection of lamp voltage +
S- BK (thin) Detection of lamp voltage -
P- BK (thick) Lamp voltage -
A (1) RD Scattered light sensor +
C(1) BK Scattered light sensor -
SH (1) GY Shield
A (2) WH Sensor reference +
C(2) GN Channel 1 Sensor reference -
SH (2) GY Channel 1 Shield
6.2 Lamp voltage
Sensor version Lamp type Lamp voltage [V]
OUSTF10-xxxxx Collimated incandescent lamp 4.9 ± 0.1
6.3 Versions for use in hazardous areas
Section applies only to measuring points consisting of a photometer, cable set CUK80
and a Liquiline CM44P transmitter.
Safety instructions for electrical apparatus in explosion-hazardous areas, XA01403C
6.3.1 Connecting the detector using a safety barrier
The photometer sensors use silicon photovoltaic cells as detectors which are operated in the
current mode. The detectors are intrinsically safe and can be deployed in Zone 1 and Class I,
Division 1 environments.

OUSTF10 Electrical connection
Endress+Hauser 15
The safe area is separated from the hazardous area by two safety barriers MTL7760AC.
105 (4.13)
90 (3.54)
12.6 (0.5)
 8 Safety barrier, dimensions in mm (inch)
The safety barrier may only have a very low leak current since the optical signals from
the sensor can be in the nanoampere range. Therefore, the sensor cable shield is
connected to the ground terminal of the barrier.
On delivery, the CUK80 detector cable is permanently wired to the safety barriers. All you
have to do is simply connect the individual cable ends to the detector and transmitter.
1. Mount safety barriers including grounding module on a DIN rail.

2. Connect the detector plug of the cable to the detector.

Electrical connection OUSTF10
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3. Connect the other end of the cable to the transmitter.
3
4
1
2
WH
GN
3
4
1
2
GY
RD
BK
GY
Transmitter
2x MTL7760ac
Photometer
(Det.)
A (2)
C (2)
SH (1)
RD
BK
A (1)
C (1)
SH (1)
WH
GN
GY
6.3.2 Connecting the hazardous area lamp using a junction box
The hazardous area lamp (EXP-1) must be connected to the transmitter using a certified
junction box.
For versions with FM approval, the junction box is included in the delivery and already
pre-terminated on the lamp side. You simply have to connect the cable of the transmitter
(CUK80) to the terminals of the junction box.
For versions with ATEX approval, the junction box is not included in the delivery and it
and the cable glands required must be provided by the customer at the place of
installation. You must connect the cables entirely on your own (CUK80 of transmitter
and lamp cable of photometer sensor).

OUSTF10 Electrical connection
Endress+Hauser 17
Transmitter
S-
P+
P-
YE
YE
BK
BK
S+
EXP-1
ATEX II 2G Ex db IIC T5 Gb
FM Cl.1, Div. 1, Groups B, C, D
PE
30
27
A0029440
 9 Connecting the hazardous area lamp to CM44P via a junction box
6.4 Ensuring the degree of protection
Only the mechanical and electrical connections which are described in these instructions and
which are necessary for the required, designated use, may be carried out on the device
delivered.
‣Exercise care when carrying out the work.
Individual types of protection permitted for this product (impermeability (IP), electrical safety,
EMC interference immunity, Ex protection) can no longer be guaranteed if, for example :
• Covers are left off
• Different power units to the ones supplied are used
• Cable glands are not sufficiently tightened (must be tightened with 2 Nm (1.5 lbf ft) for the
permitted level of IP protection)
• Unsuitable cable diameters are used for the cable glands
• Modules are not fully secured
• The display is not fully secured (risk of moisture entering due to inadequate sealing)
• Loose or insufficiently tightened cables/cable ends
• Conductive cable strands are left in the device

Electrical connection OUSTF10
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6.5 Post-connection check
Device condition and specifications Notes
Are the sensor, assembly and cable free from damage on the outside? Visual inspection
Electrical connection Notes
Does the supply voltage of the connected transmitter match the data on the
nameplate?
Visual inspection
Are the installed cables strain-relieved and not twisted?
Has the cable been routed without loops and cross-overs? Check that it is firmly seated (by
pulling gently)
Are the signal cables connected correctly according to the connection diagram?
Are all cable entries mounted, tightened and leak-tight? For lateral cable entries, make sure
the cables loop downwards to allow
water to drip off.
Are the PE distributor rails grounded (if present)? Grounding at the point of
installation

OUSTF10 Commissioning
Endress+Hauser 19
7 Commissioning
7.1 Function check
Prior to initial commissioning, ensure that:
• The sensor is correctly installed
• The electrical connection is correct
7.2 Calibrating/adjusting the sensor
Measuring points consisting of a photometer sensor, flow assembly (if provided) and a
transmitter are adjusted at the factory. Normally adjustment is not required when
commissioning for the first time.
If an adjustment is desired nevertheless, you have the following adjustment option:
Adjustment with calibration standards
Use a solution of known turbidity for the calibration/adjustment.
• Formazin
Measuring systems that have been configured for FTU are calibrated using a formazin
standard solution.
• Diatomaceous earth
Devices that have been configured for ppm are calibrated using a diatomaceous earth (DE)
standard solution.
LWARNING
Formazin is carcinogenic, has a sensitizing effect and is harmful for water organisms,
with a long-term effect.
May cause cancer and allergic skin reactions.
‣Seek special advice before use.
‣Use the specified personal protective equipment.
‣Read and make sure you understand all the safety instructions in the Safety Datasheets
prior to use.
‣Avoid releasing the substance into the environment.
Preparing a formazin standard solution
1. Dilute 1 g of hydrazine sulfate in 100 ml of ultrapure water in a volumetric flask.
2. In another volumetric flask, dilute 10 g of hexamethylenetetramine in 100 ml of
ultrapure water.
3. Mix 5 ml of each solution together and allow the mixture to stand for 24 to 48 hours at
room temperature (25 ±3 °C).
4. Once the suspension has formed, dilute with ultrapure water to 100 ml.
 This stock suspension is defined as 400 FTU (formazin turbidity unit).
1 FTU = 1 NTU (nephelometric turbidity unit) and 4 FTU = 1 EBC (European
Brewery Convention Unit)
The suspension prepared in this way is stable and can be stored for up to 1 month in a
lightproof bottle in a cool and dry place.

Commissioning OUSTF10
20 Endress+Hauser
You can dilute the suspension to produce a series of optical standard solutions. You can check
the calibration of the measuring system with the standard solutions.
Stock suspension [ml] Ultrapure water [ml] FTU NTU EBC
100 0 400 400 100
50 50 200 200 50
25 75 100 100 25
20 80 80 80 20
10 90 40 40 10
5 95 20 20 5
2.5 97.5 10 10 2.5
1.0 99 4 4 1
It is not recommended to dilute the stock suspension below 4 FTU.
Preparing diatomaceous earth standard solution
Diatomaceous earth (DE) is used as the filter medium in a wide variety of filtration processes.
Therefore, when monitoring the solids content in the filter inlet and outlet the measurement
will correlate directly with the adjustment. If other materials are measured, the values
displayed on the device may need to be correlated with the actual process values.
Note that accuracy and reproducibility properties when using diatomaceous earth standard
solutions (DE) depend on the level of precision exercised in preparing the standard. DE in a
suspension settles out relatively quickly. Therefore, it is very important to mix the sample
carefully and determine the measured values as soon as the mixture is stable.
1. Add 1 g dry diatomaceous earth to 1,000 ml ultrapure water.
 You get an aqueous suspension of 1000 ppm DE.
2. Shake the suspension carefully before diluting.
3. Use the suspension to prepare a range of dilution solutions.
DE suspension [ml] Ultrapure water [ml] ppm
1 99 10
2 98 20
5 95 50
10 90 100
50 50 500
100 0 1000